Global Patent Index - EP 0492889 A3

EP 0492889 A3 19920923 - CROSSTALK QUANTITY DETECTOR

Title (en)

CROSSTALK QUANTITY DETECTOR

Publication

EP 0492889 A3 19920923 (EN)

Application

EP 91311495 A 19911211

Priority

JP 40309890 A 19901218

Abstract (en)

[origin: EP0492889A2] There is disclosed a crosstalk detector (101 SIMILAR 105) for detecting a quantity of crosstalk of signals optically read from a recording medium having a plurality of tracks for memorizing information. Where crosstalk detecting signals different from each other are recorded at positions in correspondence with each other on the normal with respect to the tracks between adjacent tracks on the recording medium, the detector comprises means (101, 102, 103) for comparing read signal levels between adjacent tracks at the positions where the crosstalk detecting signals are recorded to thereby calculate a quantity of crosstalk of the read signals. Further, where crosstalk detecting signals are recorded at positions which are not in correspondence with each other on the normal with respect to the tracks between adjacent tracks, the detector comprises means (104, 105) for comparing read signal levels between adjacent tracks at the positions where the crosstalk signals included in the read signals are recorded to thereby calculate a quantity of crosstalk of the read signals. <IMAGE>

IPC 1-7

G11B 20/22

IPC 8 full level

G11B 7/00 (2006.01); G11B 7/005 (2006.01); G11B 7/095 (2006.01); G11B 20/02 (2006.01); G11B 20/22 (2006.01)

CPC (source: EP US)

G11B 7/005 (2013.01 - EP US); G11B 7/0956 (2013.01 - EP US); G11B 20/22 (2013.01 - EP US)

Citation (search report)

  • [A] EP 0397354 A2 19901114 - PIONEER ELECTRONIC CORP [JP]
  • [A] US 4486791 A 19841204 - WADA YOSHIYO [JP], et al
  • [A] GB 2098761 A 19821124 - PIONEER VIDEO CORP
  • [A] PATENT ABSTRACTS OF JAPAN vol. 6, no. 75 (P-114)12 May 1982 & JP-A-57 012 413 ( JVC ) 22 January 1982
  • [A] PATENT ABSTRACTS OF JAPAN vol. 13, no. 263 (P-886)19 June 1989 & JP-A-1 057 425 ( MATSUSHITA ELECTRIC IND. CO. ) 3 March 1989
  • [A] PATENT ABSTRACTS OF JAPAN vol. 7, no. 32 (P-174)8 February 1983 & JP-A-57 186 223 ( YUNIBAASARU PAIONIA K.K. ) 16 November 1982

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0492889 A2 19920701; EP 0492889 A3 19920923; JP H04216326 A 19920806; US 5321519 A 19940614; US 5481369 A 19960102

DOCDB simple family (application)

EP 91311495 A 19911211; JP 40309890 A 19901218; US 19761194 A 19940217; US 4693293 A 19930413